Ummm, the game seems to have some issues. Most see it doesnt to co op better than Borderlands and doesnt do PvP better than a lot of other shooters. Its also a game that is blatent in its reliance on DLC, which turns a lot of people off. Its at a 75 meta, which by most reviewers is in the territory of average. You rate it 9/10 which is in the range of one fo the best games of the genre, which is not a vastly popular rating amongst most that have played/reviewed it.
You said games in its category.
What games are really in its category. You take the best out of games that do one thing well and compare it to Destiny but dont consider the fact the Destiny does things those game dont even attempt. Does CoD let you use your PvP gear sets on Campain, does Borderlands have a full PvP suite? That is the issue. Reviews are comparing each componant to the best in class at that componant without consider the fact that the game that does whatever better than Destiny does nothing else.
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut